I have a page which is usually called with id parameter to get the details for specific object, something like:
http://www.mywebsite.com/admin/productdetails.aspx?Id=1982
On page_load this is the code I have:
if (!Page.IsPostBack)
{
if (Request.QueryString[0] != null)
{
DataTable tbl = new DataTable();
tbl = hpl.getProductDetail(Convert.ToInt32(Request.QueryString[0]));
if (tbl.Rows.Count > 0)
{
}
}
else
{
Response.Redirect("ProductList.aspx");
}
}
And this is the error I'm getting http://prntscr.com/jd554l
also the URL adds extra parameter and it becomes http://www.mywebsite.com/admin/productdetails.aspx?Id=1982&Id=1982
Any idea what is happening?
Related
My stored procedure, instead of returning zero rows, returns one with most of the columns NULL. When my .Net code sees such data, I wish to force it to display the EmptyDataTemplate. How?
Thanks Win,
In the LinqDataSource Selecting event handler I check if the data source has a size of one and has a null value for one of the key fields and then I pass in this to the LinqDataSourceSelectEventArgs' Result:
using (var dataContext = new WebDataContext())
{
var report = from row in dataContext.GetReport()
select new Report()
{
AccountCode = row.AccountCode //,
//...
}
}
if (report.Count() == 1 && report.ToList()[0].AccountCode == null)
{
var emptyReport = report.ToList();
report.Clear();
e.Result = emptyReport;
}
else
{
//...
e.Result = matrixReport;
//...
}
Scenario:
User submits search criteria and selects an item from search results on the same page, which navigates to a new page of details for the selected item.
When the User returns to the search screen, the search criteria & results (including selected page and sort-order) should be preserved from their last visit.
Related information:
All form submissions are POSTs.
Navigation back to the search screen may not be available from last browser history (e.g. more than one details screen may be encountered, or the user may navigate directly to the search screen from an alternative menu.)
Search results are provided using Telerik RadGrid control.
I'm looking for a generic solution that will be able to be applied to different search screens.
In some instances, the item may be DELETED from within the details screen, and should therefore not appear in the search results when the screen is next encountered.
Thoughts:
I've read a lot of suggested methods for addressing various parts of this scenario, but I'm still confused; no comprehensively "correct" solution jumps to the forefront.
I guess I'm asking for recommendations/approach rather than a whole solution spelled out for me (although that would be nice! ;-)
The .NET VIEWSTATE would seem to do exactly what I'm after (with the exception of #5) - Is there some way of leveraging off this so that viewstate can be used between pages, and not just between postbacks to the same page? (e.g. can I store/restore viewstate to/from a session variable or something? I haven't seen this suggested anywhere and I'm wondering if there's a reason why.)
Thanks in advance.
Thanks for all the advice.
For the benefit of others, here is a solution to this issue (no doubt there's room for improvement, but this works satisfactorily for the moment).
4 functions...
StoreSearchCookie - Persist the state/values of a panel of search criteria and a results grid in a cookie with a specified UID.
RestoreSearchCookie_Criteria - Read the cookie and re-populate the search criteira
RestoreSearchCookie_Results - Read the cookie and restore the grid state.
FindFormControls - Helper method to recursively find form-input controls in a container (pinched & modified from elsewhere on Stack Overflow)
NB...
I haven't addressed the multiple-tabs issue because our application doesn't allow them anyway.
RestoreSearchResults utilises GridSettingsPersister.cs available from Telerik website, (but I had to modify it to store the page number as well)
Usage is as follows...
protected void Page_PreRender(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
// Store the state of the page
StoreSearchCookie("SomeSearchPage", pnlSearchCriteria, gridResults);
}
else
{
// Restore search criteria
RestoreSearchCookie_Criteria("SomeSearchPage");
// Re-invoke the search here
DoSearch(); // (for example)
// Restore the grid state
RestoreSearchCookie_Results("SomeSearchPage");
}
}
Code follows...
protected void StoreSearchCookie(string cookieName, Panel SearchPanel, RadGrid ResultsGrid)
{
try
{
HttpCookie cookieCriteria = new HttpCookie("StoredSearchCriteria_" + cookieName);
// 1. Store the search criteria
//
List<Control> controls = new List<Control>();
FindFormControls(controls, SearchPanel);
foreach (Control control in controls)
{
string id = control.ID;
string parentId = control.Parent.ID;
string uid = string.Format("{0}>{1}", parentId, id);
string value = "";
Type type = control.GetType();
bool isValidType = true; // Optimistic!
if (type == typeof(TextBox))
{
value = ((TextBox)control).Text;
}
else if (type == typeof(DropDownList))
{
value = ((DropDownList)control).SelectedValue;
}
else if (type == typeof(HiddenField))
{
value = ((HiddenField)control).Value;
}
else if (type == typeof(RadioButton))
{
value = ((RadioButton)control).Checked.ToString();
}
else if (type == typeof(CheckBox))
{
value = ((CheckBox)control).Checked.ToString();
}
else
{
isValidType = false;
}
if (isValidType)
{
cookieCriteria.Values[uid] = value;
}
}
cookieCriteria.Expires = DateTime.Now.AddDays(1d);
Response.Cookies.Add(cookieCriteria);
// 2. Persist the grid settings
//
GridSettingsPersister SavePersister = new GridSettingsPersister(ResultsGrid);
HttpCookie cookieResults = new HttpCookie("StoredSearchResults_" + cookieName);
cookieResults.Values["GridId"] = ResultsGrid.ID;
cookieResults.Values["GridSettings"] = SavePersister.SaveSettings();
cookieResults.Expires = DateTime.Now.AddDays(1d);
Response.Cookies.Add(cookieResults);
}
catch (Exception exception)
{
Logger.Write(exception);
}
}
protected void RestoreSearchCookie_Criteria(string cookieName)
{
try
{
HttpCookie cookieCriteria = Request.Cookies["StoredSearchCriteria_" + cookieName];
if (cookieCriteria != null)
{
foreach (string key in cookieCriteria.Values.AllKeys)
{
string value = cookieCriteria[key];
string[] ids = key.Split('>');
string parentId = ids[0];
string id = ids[1];
Control control = FindControl(parentId).FindControl(id);
Type type = control.GetType();
if (type == typeof(TextBox))
{
((TextBox)control).Text = value;
}
else if (type == typeof(DropDownList))
{
((DropDownList)control).SelectByValue(value);
}
else if (type == typeof(HiddenField))
{
((HiddenField)control).Value = value;
}
else if (type == typeof(RadioButton))
{
((RadioButton)control).Checked = Boolean.Parse(value);
}
else if (type == typeof(CheckBox))
{
((CheckBox)control).Checked = Boolean.Parse(value);
}
}
}
}
catch (Exception exception)
{
Logger.Write(exception);
}
}
protected void RestoreSearchCookie_Results(string cookieName)
{
try
{
HttpCookie cookieResults = Request.Cookies["StoredSearchResults_" + cookieName];
if (cookieResults != null)
{
string gridId = cookieResults.Values["GridId"];
string settings = cookieResults.Values["GridSettings"];
RadGrid grid = (RadGrid)FindControl(gridId);
GridSettingsPersister LoadPersister = new GridSettingsPersister(grid);
LoadPersister.LoadSettings(settings);
grid.Rebind();
}
}
catch (Exception exception)
{
Logger.Write(exception);
}
}
private void FindFormControls(List<Control> foundSofar, Control parent)
{
List<Type> types = new List<Type> { typeof(TextBox), typeof(DropDownList), typeof(RadioButton), typeof(CheckBox), typeof(HiddenField) };
foreach (Control control in parent.Controls)
{
if (types.Any(item => item == control.GetType()))
{
foundSofar.Add(control);
}
if (control.Controls.Count > 0)
{
this.FindFormControls(foundSofar, control); // Use recursion to find all descendants.
}
}
}
I tried to Filter an ASPxComboBox that gets data using an XpoDataSource, note that restoring and filtering data from a small data set works fine , the issue start when I try to filter large dataset - about 70000 records- from datasource the ComboBox loading becomes very slow since XpoDataSource gets all data from database table .
So I created a criteria for the XpoDataSource to reduce number of records restored ,then the ComboBox Keeps repeating the top 10 records while scrolling down the ComboBox, I don't know where the problem is.
I realized that what I need is similar to the example in the following link
But using an XpoDataSource instead of SqlDataSource1 .
I don't know how to write a similar code for an XpoDataSource .
this is my code :
protected void cmbServices_OnItemRequestedByValue_SQL(object source, DevExpress.Web.ASPxEditors.ListEditItemRequestedByValueEventArgs e)
{
try
{
string criteria = "";
if (string.IsNullOrEmpty(e.Value.ToString()) || e.Value.ToString().Length < 3)
{
criteria = "1 = 2";
}
else
{
criteria =
string.Format("(( Code like '{0}%' OR ProductName like '{0}%') AND CustomerId = {1})", e.Value.ToString(), (cmbServicesActivities != null && cmbServicesActivities.Value != null) ? cmbServicesActivities.Value.ToString() : "0");
}
dsServices.Session = LookupsSession;
dsServices.Criteria = criteria;
cmbServicesDescription.DataSource = dsServices;
cmbServicesDescription.DataBind();
}
catch (Exception exc)
{
Debug.WriteLine(exc.Message);
}
}
The Following Example demonstrates the answer of my question
public partial class _Default : System.Web.UI.Page {
Session session = XpoHelper.GetNewSession();
protected void cmb_ItemRequestedByValue(object source, DevExpress.Web.ASPxEditors.ListEditItemRequestedByValueEventArgs e) {
MyObject obj = session.GetObjectByKey<MyObject>(e.Value);
if (obj != null) {
cmb.DataSource = new MyObject[] { obj };
cmb.DataBindItems();
}
}
protected void cmb_ItemsRequestedByFilterCondition(object source, DevExpress.Web.ASPxEditors.ListEditItemsRequestedByFilterConditionEventArgs e) {
XPCollection<MyObject> collection = new XPCollection<MyObject>(session);
collection.SkipReturnedObjects = e.BeginIndex;
collection.TopReturnedObjects = e.EndIndex - e.BeginIndex + 1;
collection.Criteria = new BinaryOperator("Title", String.Format("%{0}%", e.Filter), BinaryOperatorType.Like);
collection.Sorting.Add(new SortProperty("Oid", DevExpress.Xpo.DB.SortingDirection.Ascending));
cmb.DataSource = collection;
cmb.DataBindItems();
}
I create a new event Handler to handle two different events. One is for saving a new document. The other is for saving an edit.
I added this in my Page_load:
if (Request.QueryString["ExhibitID"] != null)//new
{
if (!IsPostBack)
{
ddlCaseFiles.DataSourceID = "dsCaseFiles";
ddlCaseFiles.DataTextField = "Display";
ddlCaseFiles.DataValueField = "FileID";
rbByFileID.Checked = true;
rbMyFiles.Checked = false;
ddlCaseFiles.DataBind();
editExhibit(int.Parse(Request.QueryString["ExhibitID"]));//new
exhibitHeader.InnerText = "Edit Exhibit";
}
hidSavedExhibitID.Value = Request.QueryString["ExhibitID"];
saveExhibitBtn.Click += new EventHandler(this.btnUpdateExhibit_Click);
}
else
{
saveExhibitBtn.Click += new EventHandler(this.saveExhibitBtn_Click);
}
my save method for some reason keeps looping then crashing because the second time it goes through, there is no data since I reset it after the first save. I have no idea why it is running my save method twice.
this is my save method :
protected void saveExhibitBtn_Click(object sender, EventArgs e)
{
hidSavedExhibitID.Value = null;
int newExhibitID = saveExhibit();
int propertyID = autoCreateProperty(newExhibitID);
linkExhibitAndProperty(newExhibitID, propertyID);
SaveInfoIntoSessionVariables();
ClearFormFields();
}
the "saveExhibit()" method is where I actually access the DB and store everything. It works fine.
Because you re bind your datas in your Page_Load.
You must persist your datas with ViewState, EnableViewState="true"
You bind your datas just one time, in the ! IsPostBack. in order to not erase the selected values
If(! IsPostBack)
{
//Bind your datas with `DataBind()`
}
{
--
public static IEnumerable<Datarow> Codes(string topvalue)
{
DataTable itemCodes = new DataTable();
itemCodes.Columns.Add("itemId");
itemCodes.Columns.Add("itemCode");
itemCodes.Rows.Add(0, firstCallingCode);
DataTable Codes = GetAllItems().Tables[0];
foreach (DataRow item in Codes.Rows)
{
if (item["ItemCode"] != DBNull.Value)
{
itemCodes.Rows.Add(item.Field<int?>("itemId"), item.Field<string>("itemCode"));
}
}
return itemCodes.AsEnumerable();d
}
how can i bind it to dropdownlist: i tried this
ddcodes.datasource = codes.getenumerable();
ddcodes.databind();
when i do this i get error about typecast. i can not solve it tried a lot please help.
my method is actually this
public static IEnumerable"Datarow" Codes(string topvalue)
dont know why editor took that datarow off. bracket and datarow.
You just need to pass in the return value from the Codes method.
ddcodes.datasource = Codes();
ddcodes.databind();
You don't need to "get" an enumerable. The Codes method is already returning one.